Abstract
The temperature dependence of the hyperfine splitting of the 8.42 keVγ-ray of Tm169 in oxide crystals was investigated using the Mosbauer-effect. The quadrupole splitting of the first excited state in Tm169 showed a pronounced increase with decreasing temperature. This manifests a contribution of various Stark levels, which are occupied according to their Boltzmann factors, to an average field gradient at the nucleus. It is shown in a model calculation for the temperature dependence of the field gradient that the data can be explained using a maximum splitting of about 400 cm−1 of the electronic groundstate by the crystal field.
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